Replacing bottom bracket? Possible gains/consequences

Having taking off my crankset to change chainrings, running my finger around the bb bearings feels grainy.
Does this suggest that I should be replacing them? And If so, what would the benefits of doing so be, and consequences of not?
Does this suggest that I should be replacing them? And If so, what would the benefits of doing so be, and consequences of not?
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Strava - Alex Taylor (sportstest.co.uk)
ABCC Cycling Coach
If they are feeling notchy already, then replace.
As a matter of interest, how clean/dry was that BB area? A great deal of problems users have with BB30 is allowing water to get into the bb area somehow and then forgetting to do anything about it but not forgetting to log onto forums and whinge about it.... OP note I not refer to you
Exactly. Why not get the most amount of use out of them ? I've had bearings last months longer after feeling rough/notchy.
Relube them and see what happens.